“层间氧化矿”是云南个旧锡矿田的一种重要成矿类型,也是个旧锡矿目前乃至今后开采的主要矿床类型。传统观点认为“层间氧化矿”为原生硫化矿经后期风化氧化成因[1,2],通过详细观察研究,我们认为其应为原始热水沉积成因。本文就“层间氧化矿”的矿物学特征进行简要描述,并初步 “Intergranular oxide ore” is an important metallogenic type in Gejiu tin field in Yunnan Province and is also the main type of deposit currently and later mined in Gejiu Tin Mine. According to the traditional view, “inter-layer oxide ore” is the genesis of the later sulphide ores after the weathering and oxidation [1,2]. Through careful observation and study, we think it should be the origin of the original hydrothermal deposits. In this paper, the mineralogical characteristics of “interlayer oxide ore” are briefly described and preliminary